JPH0711892Y2 - Screwdriver with holder - Google Patents
Screwdriver with holderInfo
- Publication number
- JPH0711892Y2 JPH0711892Y2 JP1988131954U JP13195488U JPH0711892Y2 JP H0711892 Y2 JPH0711892 Y2 JP H0711892Y2 JP 1988131954 U JP1988131954 U JP 1988131954U JP 13195488 U JP13195488 U JP 13195488U JP H0711892 Y2 JPH0711892 Y2 JP H0711892Y2
- Authority
- JP
- Japan
- Prior art keywords
- machine screw
- holder
- screwdriver
- washer
- screw
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
Landscapes
- Details Of Spanners, Wrenches, And Screw Drivers And Accessories (AREA)
Description
【考案の詳細な説明】 〔産業上の利用分野〕 本考案は、各種部品の組立作業に広く用いられる座金を
備えた小ねじの締め付けを確実に行うことが可能なホル
ダー付きドライバーに関するものである。[Detailed Description of the Invention] [Industrial field of application] The present invention relates to a screwdriver with a holder capable of securely tightening a small screw having a washer widely used for assembling various parts. .
最近の大型の電子機器には各種サイズの十字穴付き小ね
じが多く使用されており、この小ねじはそれぞれ規定の
トルクで完全に締め付けることが必須条件となってい
る。このため締め付け未完時には小ねじがドライバーに
保持されており、一定のトルクで締め付けが完了すると
小ねじからドライバーを離脱することが可能なホルダー
付きドライバーが要求されている。Recently, large-sized electronic devices often use small screws with cross holes of various sizes, and it is essential to completely tighten these small screws with specified torques. For this reason, a small screw is held by the driver when the tightening is not completed, and a driver with a holder that can separate the screwdriver from the small screw when the tightening is completed with a certain torque is required.
従来の十字穴付き小ねじを保持して締着するドライバー
は、JIS−B4633に示されるように小ねじの頭部に形成し
た十字穴に挿入して回転させる先端部を本体の一端に設
け、他端に回動用の握り部を設けた十字ねじ回しこの先
端部を磁化して、この先端部を十字穴に挿入すると磁気
により吸引されて鋼製の小ねじを保持する汎用のマグネ
ットプラスドライバーが用いられている。A driver that holds and fastens a conventional machine screw with a cross hole is provided at one end of the main body with a tip part that is inserted into a cross hole formed in the head of the machine screw and rotated as shown in JIS-B4633. A general-purpose magnet Phillips screwdriver that holds a small machine screw made of magnetism by magnetizing the tip of this cross-shaped screwdriver with a grip for rotation at the other end and inserting this tip into the cross hole It is used.
また、第３図に示すように小ねじ２の頭部2-2に形成し
た十字穴2-2aに挿入する本体5-1の先端部5-1aの近傍を
膨らませてストッパ5-1bを形成し、複数の板ばね6-2を
対向させて固着したリング6-1に本体5-1を嵌入し、ホル
ダー６がこの本体5-1のストッパ5-1bと図示しない握り
部との間に軸心方向に摺動可能なように構成している。Further, as shown in FIG. 3, a stopper 5-1b is formed by inflating the vicinity of the tip 5-1a of the main body 5-1 to be inserted into the cross hole 2-2a formed in the head 2-2 of the machine screw 2. Then, the main body 5-1 is inserted into the ring 6-1 which is fixed by facing the plurality of leaf springs 6-2, and the holder 6 is inserted between the stopper 5-1b of the main body 5-1 and the grip portion (not shown). It is configured to be slidable in the axial direction.
そして、小ねじの十字穴2-2aにマグネットプラスドライ
バーの先端部を挿入して磁力によりこの小ねじを保持す
るか、或いは第３図に示すように本体5-1の先端部5-1a
を小ねじの十字穴2-2aに挿入するとともに、ホルダー６
の板ばね6-2により頭部2-2を挟んで小ねじ（２）を保持
して、このねじ部2-1を被締着品１のねじ穴にねじ込ん
で小ねじの締め付けを行っている。Then, insert the tip of a magnet Phillips screwdriver into the cross hole 2-2a of the machine screw to hold the machine screw by magnetic force, or, as shown in FIG. 3, the tip 5-1a of the body 5-1.
Insert into the cross hole 2-2a of the machine screw, and hold the holder 6
Hold the machine screw (2) by sandwiching the head section 2-2 with the leaf spring 6-2, and screw this screw section 2-1 into the screw hole of the workpiece 1 to tighten the machine screw. There is.
以上説明した従来のホルダー付きドライバーで問題とな
るのは、ホルダーの対向する板ばねの弾性により小ねじ
の頭部を保持しているため、ねじのドライバーへの挿抜
は容易であり、ねじ締め付け作業中に他の要件で一時作
業を中止して離籍する場合には、小ねじを完全に締め付
けない状態で小ねじからドライバーを離脱して離席する
ことが多く、他の要件終了後再び作業を開始した場合
に、完全に締め付けない状態の小ねじを完全に締め付け
ないで、次の小ねじの締め付け作業に移行することがあ
り、完全に締め付けない状態の小ねじが規定のトルクで
締め付けられないために締め付けの信頼性が悪くなると
いう問題点があった。The problem with the conventional screwdriver with a holder described above is that the head of the machine screw is held by the elasticity of the opposing leaf springs of the holder, so it is easy to insert and remove the screw to and from the screwdriver. If you want to stop temporarily and leave your job due to other requirements, you often leave the driver by leaving the machine screw without fully tightening the machine screw. If started, the machine screws that have not been completely tightened may not be completely tightened and the work may proceed to tighten the next machine screw.The machine screws that are not completely tightened may not be tightened with the specified torque. Therefore, there is a problem that reliability of tightening is deteriorated.
本考案はこのような問題点に鑑み、締め付け未完の場合
には座金付き小ねじをドライバーにより強固に保持し、
一定のトルクで小ねじを締め付けなければ小ねじからド
ライバーを離脱させることができず、一定のトルクで小
ねじの締め付けが完了すれば、小ねじからドライバーを
離脱させることが可能となるホルダーの提供を目的とす
る。In consideration of such problems, the present invention firmly holds a machine screw with a washer with a screwdriver when tightening is not completed,
Providing a holder that enables the driver to be removed from the machine screw without tightening the machine screw with a certain torque, and allows the driver to be removed from the machine screw when the machine screw is tightened with a certain torque With the goal.
〔問題点を解決するための手段） 本考案のホルダー付きドライバーは第１図に示すよう
に、棒材よりなる本体15-1の一端に、座金を備えた小ね
じ２の頭部2-2に形成した十字穴2-2aに挿入する先端部1
5-1aを備え、この先端部15-1aの近傍にこの先端部15-1a
の外径よりも大きな外径を有する係合部15-1bを有し、
この先端部15-1aの他端に回動用の握り部を固着したね
じ回し15と、一方の開口の内側にこの小ねじ２のこの頭
部2-2を係着する爪16-2aを設けた弾性を有する係着部16
-2を備え、他方にこのねじ回し15の係合部15-1bを抱持
する回動部16-1を形成したホルダー16とからなり、この
ホルダー16のスリット16-2bにより分割されたこの係着
部16-2には、内側に突出した複数の爪16-2aが形成され
ており、この爪16-2aの先端の内径はこの小ねじ２の頭
部2-2の外径よりも小さく、この爪16-2aの厚さがこの座
金３の厚さよりも小さく、この爪16-2aの開口側にはテ
ーパー16-2a1が形成されており、このホルダー16の回動
部16-1にこのねじ回し15の係合部15-1bを枢着すること
により、この爪16-2aとこのねじ回し15の先端部15-1aで
この座金（３）を備えた小ねじ２を保持するように構成
する。[Means for Solving Problems] As shown in FIG. 1, the holder-equipped screwdriver of the present invention has a head 2-2 of a machine screw 2 provided with a washer at one end of a body 15-1 made of a rod material. Tip 1 to be inserted in the cross hole 2-2a formed in
5-1a is provided, and the tip 15-1a is provided near the tip 15-1a.
Having an engaging portion 15-1b having an outer diameter larger than the outer diameter of
A screwdriver 15 having a grip for rotation fixed to the other end of the tip portion 15-1a, and a claw 16-2a for engaging the head 2-2 of the machine screw 2 are provided inside one opening. Fastening part 16 with elasticity
-2, and a holder 16 formed with a rotating portion 16-1 for holding the engaging portion 15-1b of the screwdriver 15 on the other side, which is divided by the slit 16-2b of the holder 16. The engaging portion 16-2 is formed with a plurality of claws 16-2a protruding inward, and the inner diameter of the tip of the claw 16-2a is larger than the outer diameter of the head 2-2 of the machine screw 2. The claw 16-2a has a smaller thickness than the washer 3 and a taper 16-2a 1 is formed on the opening side of the claw 16-2a. By pivotally attaching the engaging portion 15-1b of the screwdriver 15 to 1, the small screw 2 provided with the washer (3) is held by the claw 16-2a and the tip portion 15-1a of the screwdriver 15. To configure.
本考案においては座金を備えた小ねじの頭部をホルダー
の爪の開口側に形成されているテーパーに押し当ててホ
ルダーの係着部の内側に設けた爪を外方に押し拡げ、こ
の小ねじの頭部のみをこの爪の間を通過させ、この小ね
じの座面と座金との間にこの爪を係止した状態で小ねじ
をホルダーに固定し、この小ねじのねじ部を被締着品の
ねじ孔にねじ込む。In the present invention, the head of a small screw with a washer is pressed against the taper formed on the opening side of the claw of the holder, and the claw provided inside the engaging part of the holder is pushed outward to expand this small. Only pass the head of the screw between the claws, fix the claws to the holder with the claws locked between the seat surface of the machine screw and the washer, and cover the threaded part of the machine screw. Screw it into the screw hole of the fastened product.
その後小ねじを締め込んでゆき座金を被締着品に当て、
更に小ねじを締め込んでゆき被締着品と座金と小ねじの
座面とを密着させると、この座金の外径がこの爪の先端
の内径より大きく、この爪の厚さがこの座金の厚さより
も小さいので、ホルダーの係着部の内側に設けた爪が、
この爪に設けたテーパーと座金との接触により押し拡げ
られ、この爪の内径が小ねじの頭部の外径より広くな
り、本考案のドライバーを小ねじから離脱させることが
可能となる。After that, tighten the small screw, apply the washer to the product to be fastened,
When the machine screw is further tightened to bring the object to be fastened, the washer, and the seat surface of the machine screw into close contact, the outside diameter of this washer is larger than the inside diameter of the tip of this claw, and the thickness of this claw is Since it is smaller than the thickness, the claws provided on the inside of the holder engagement part
The taper provided on the claw is pushed and expanded by the contact with the washer, and the inner diameter of the claw becomes larger than the outer diameter of the head of the machine screw, so that the driver of the present invention can be detached from the machine screw.
以下第１図及び第２図により本考案の十字穴付き小ねじ
の実施例について詳細に説明する。An embodiment of a machine screw having a cross hole according to the present invention will be described in detail below with reference to FIGS. 1 and 2.
第１図は本考案の一実施例によるホルダー付きドライバ
ーを示す図、第２図は本実施例の作用を説明する断面図
であり、図中の第３図と同一部材には同一符号を付して
いるが、それ以外の15は小ねじ２を被締着品１に締め付
ける十字ねじ回し、16は小ねじ２の頭部2-2を係着する
ホルダーである。FIG. 1 is a view showing a driver with a holder according to an embodiment of the present invention, and FIG. 2 is a sectional view for explaining the operation of the present embodiment. The same members as those in FIG. 3 are designated by the same reference numerals. Other than that, reference numeral 15 is a cross screwdriver for fastening the machine screw 2 to the article to be fastened 1, and 16 is a holder for attaching the head 2-2 of the machine screw 2.
十字ねじ回し15は、第１図に示すように小ねじ２の頭部
2-2に形成した回転用の十字穴2-2aに挿入する先端部15-
1aを一端に形成した従来と同一形状の本体15-1に、円筒
状の金具を先端部15-1aの近傍に嵌着固定して係合部15-
1bを形成し、反対側に本体15-1回動用の図示しない握り
部を固定したものである。The cross screwdriver 15 is the head of the machine screw 2 as shown in FIG.
Tip part to be inserted into the cross hole 2-2a for rotation formed in 2-2
The main body 15-1 having the same shape as the conventional one having 1a formed at one end is fitted and fixed with a cylindrical metal fitting in the vicinity of the tip portion 15-1a to engage the engagement portion 15-.
1b is formed, and a grip portion (not shown) for turning the main body 15-1 is fixed to the opposite side.
ホルダー16は、第２図（ａ）に示すように弾性の優れた
金属により小ねじ２の頭部2-2を保持する、スリット16-
2bにより分割されている直径の大きな係着部16-2と、十
字ねじ回し15の本体15-1と先端部15-1aと係合部15-1bと
を遊嵌させる直径の小さな回動部16-1とから構成されて
いる。As shown in FIG. 2 (a), the holder 16 holds the head 2-2 of the machine screw 2 with a metal having excellent elasticity.
An engaging portion 16-2 having a large diameter divided by 2b, a rotating portion having a small diameter for loosely fitting the main body 15-1 of the cross screwdriver 15, the tip portion 15-1a and the engaging portion 15-1b. It consists of 16-1 and.
この係着部16-2の開口の内側にはスリット16-2bにより
分割された、内径が小ねじ２の頭部2-2の外径よりも小
さな爪16-2aが形成されており、この爪16-2aの厚さがこ
の座金２の厚さよりも小さく、この爪16-2aの開口側に
はテーパー16-2a1が形成されている。Inside the opening of this engaging portion 16-2, a claw 16-2a divided by a slit 16-2b and having an inner diameter smaller than the outer diameter of the head 2-2 of the machine screw 2 is formed. The thickness of the pawl 16-2a is smaller than the thickness of the washer 2, and a taper 16-2a 1 is formed on the opening side of the pawl 16-2a.
このホルダー付きドライバーを用いる場合には、第２図
（ａ）に示すように座金３を備えた小ねじ２の頭部2-2
をホルダー16の爪16-2aの開口側に形成されているテー
パー16-2a1に押し当てて、ホルダー16の係着部16-2の内
側に設けた爪16-2aを外方に押し拡げ、この小ねじ２の
頭部2-2のみをこの爪16-2aの間を通過させ、この小ねじ
２の座面2-2bと座金３との間にこの爪16-2aを係止した
状態で小ねじ２をホルダー16に固定し、この小ねじ２の
ねじ部2-1を被締着品１のねじ孔にねじ込む。When using this screwdriver with a holder, the head 2-2 of the machine screw 2 provided with a washer 3 as shown in FIG. 2 (a).
To the taper 16-2a 1 formed on the opening side of the claw 16-2a of the holder 16 and push the claw 16-2a provided inside the engaging portion 16-2 of the holder 16 outward. , Only the head 2-2 of the machine screw 2 is passed between the claws 16-2a, and the claw 16-2a is locked between the seat surface 2-2b of the machine screw 2 and the washer 3. In this state, the small screw 2 is fixed to the holder 16, and the screw portion 2-1 of the small screw 2 is screwed into the screw hole of the article to be fastened 1.
その後、小ねじ２を締め込んでき座金３を被締着品１に
当て、更に小ねじ２を締め込んでゆき第２図（ｂ）に示
すように被締着品１と座金３と小ねじ２の座面2-2bとを
密着させると、この座金３の外径がこの爪16-2aの先端
の内径より大きく、この爪16-2aの厚さがこの座金３の
厚さよりも小さいので、ホルダー16の係着部16-2の内側
に設けた爪16-2aが、この爪16-2aに設けたテーパー16-2
a1と座金３との接触により押し拡げられ、この爪16-2a
の内径が小ねじ２の頭部2-2の外径より広くなり、本考
案のドライバーを小ねじ２から離脱させることが可能と
なる。After that, the machine screw 2 is tightened, the washer 3 is applied to the article to be fastened 1, and the machine screw 2 is further tightened until the article to be fastened 1, the washer 3 and the machine screw 3 are tightened as shown in FIG. 2 (b). When the washer 3 is brought into close contact with the seat surface 2-2b, the outer diameter of the washer 3 is larger than the inner diameter of the tip of the claw 16-2a, and the thickness of the claw 16-2a is smaller than the thickness of the washer 3. The claw 16-2a provided inside the engaging portion 16-2 of the holder 16 is the taper 16-2 provided on the claw 16-2a.
The claw 16-2a is pushed out by the contact between a 1 and the washer 3.
The inner diameter of is larger than the outer diameter of the head 2-2 of the machine screw 2, and the driver of the present invention can be detached from the machine screw 2.
以上の説明から明らかなように本考案によれば、きわめ
て簡単な構成で、締め付け未完時は被締着品にねじ込ん
だ座金付き小ねじに十字ねじ回しが付いた状態となり、
完全に締め付けた時には十字ねじ回しを小ねじから離脱
させることができるので、締め付けの未完を防止するこ
とができる等の利点があり、著しい信頼性向上の効果が
期待できるホルダー付きドライバーを提供することが可
能である。As is clear from the above description, according to the present invention, with a very simple structure, when the tightening is not completed, the machine screw with washer screwed into the product to be fastened has a cross screwdriver,
Since the cross screwdriver can be removed from the machine screw when fully tightened, there are advantages such as preventing incomplete tightening, etc., and to provide a screwdriver with a holder that can be expected to significantly improve reliability. Is possible.
第１図は本考案の一実施例によるホルダー付きドライバ
ーを示す図、 第２図は本実施例の作用を説明する断面図、 第３図は従来のホルダー付きドライバーを示す図、 である。 図において、 １は被締着品、２は小ねじ、2-1はねじ部、2-2は頭部、
2-2aは十字穴、2-2bは座面、３は座金、15は十字ねじ回
し、15-1は本体、15-1aは先端部、15-1bは係合部、16-1
は回動部、16-2は係着部、16-2aは爪、16-2a1はテーパ
ー、16-2bはスリット、 を示す。FIG. 1 is a view showing a driver with a holder according to an embodiment of the present invention, FIG. 2 is a sectional view for explaining the operation of this embodiment, and FIG. 3 is a view showing a conventional driver with a holder. In the figure, 1 is an object to be fastened, 2 is a small screw, 2-1 is a threaded portion, 2-2 is a head,
2-2a is a cross hole, 2-2b is a seat surface, 3 is a washer, 15 is a cross screwdriver, 15-1 is a main body, 15-1a is a tip portion, 15-1b is an engaging portion, 16-1
Is a rotating part, 16-2 is an engaging part, 16-2a is a claw, 16-2a 1 is a taper, and 16-2b is a slit.
Claims (1)
（３）を備えた小ねじ（２）の頭部（2-2）に形成した
回転用手段（2-2a）に挿入する先端部（15-1a）を備
え、該先端部（15-1a）の近傍に前記先端部（15-1a）の
外径よりも大きな外径を有する係合部（15-1b）を有
し、前記本体（15-1）の他端に回動用の握り部を固着し
たねじ回し（15）と、 一方の開口の内側に前記小ねじ（２）の頭部（2-2）を
係着する爪（16-2a）を設けた弾性を有する係着部（16-
2）を備え、他方に前記ねじ回し（15）の係合部（15-1
b）を抱持する回動部（16-1）を形成したホルダー（1
6）とからなり、 前記座金（８）の外径は前記小ねじ（２）の頭部（2-
2）の外径に略等しく、 前記ホルダー（16）のスリット（16-2b）により分割さ
れた前記係着部（16-2）には、内側に突出した複数の爪
（16-2a）が形成されており、該爪（16-2a）の先端の内
径は前記小ねじ（２）の頭部（2-2）の外径よりも小さ
く、前記爪（16-2a）の厚さが前記座金（３）の厚さよ
りも小さく、前記爪（16-2a）の開口側にはテーパー（1
6-2a1）が形成されており、 前記ホルダー（16）の回動部（16-1）に前記ねじ回し
（15）の係合部（15-1b）を枢着することにより、前記
爪（16-2a）と前記ねじ回し（15）の先端部（15-1a）で
前記座金（３）を備えた小ねじ（２）を保持するように
構成したことを特徴とするホルダー付きドライバー。1. A rotating means (2-2a) formed on a head (2-2) of a machine screw (2) having a washer (3) at one end of a body (15-1) made of a bar material. An engaging portion (15-1b) having an outer diameter larger than the outer diameter of the tip (15-1a) in the vicinity of the tip (15-1a). And a screwdriver (15) having a grip for rotation fixed to the other end of the body (15-1), and the head (2-2) of the machine screw (2) inside one opening. An elastic engaging portion (16- provided with a claw (16-2a) for engaging the
2), and the engaging portion (15-1) of the screwdriver (15) on the other side.
b) Holder (1) that has a rotating part (16-1) for holding
6) and the outer diameter of the washer (8) is the head (2-) of the machine screw (2).
2) is substantially equal to the outer diameter of the holder (16), and the engaging portion (16-2) divided by the slit (16-2b) of the holder (16) has a plurality of inwardly projecting claws (16-2a). The inner diameter of the tip of the claw (16-2a) is smaller than the outer diameter of the head (2-2) of the machine screw (2), and the thickness of the claw (16-2a) is It is smaller than the thickness of the washer (3), and the taper (1
6-2a 1 ) is formed, and by engaging the engaging portion (15-1b) of the screwdriver (15) with the rotating portion (16-1) of the holder (16), (16-2a) and a screwdriver (15) having a tip portion (15-1a) configured to hold a machine screw (2) provided with the washer (3).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1988131954U JPH0711892Y2 (en) | 1988-10-07 | 1988-10-07 | Screwdriver with holder |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1988131954U JPH0711892Y2 (en) | 1988-10-07 | 1988-10-07 | Screwdriver with holder |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0253378U JPH0253378U (en) | 1990-04-17 |
| JPH0711892Y2 true JPH0711892Y2 (en) | 1995-03-22 |
Family
ID=31388487
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1988131954U Expired - Lifetime JPH0711892Y2 (en) | 1988-10-07 | 1988-10-07 | Screwdriver with holder |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0711892Y2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP6267955B2 (en) * | 2013-12-23 | 2018-01-24 | 敬 猪瀬 | Attachment type screw member holder |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS51113900U (en) * | 1975-03-12 | 1976-09-16 |
-
1988
- 1988-10-07 JP JP1988131954U patent/JPH0711892Y2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0253378U (en) | 1990-04-17 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| JP2716425B2 (en) | Mooring screw fixture | |
| US5921734A (en) | Lock nut device | |
| US2863351A (en) | Expanding fastener having threads of opposite hand to maintain the parts in engagement | |
| JPH0711892Y2 (en) | Screwdriver with holder | |
| US5257559A (en) | Internal pipe gripping device | |
| JPH07208422A (en) | Clamp | |
| JPH06346910A (en) | Screw tool | |
| JPH04219510A (en) | Fastening device | |
| JPH0645691Y2 (en) | Screw parts equipment | |
| KR0122045Y1 (en) | A t-type wrench | |
| JPH0720259U (en) | Multi-level socket for wrench | |
| US20020164203A1 (en) | Method of fastening panels using blind fasteners with engageable drive nuts | |
| JP2002192433A (en) | Pull stud mounting device | |
| JPH0432309U (en) | ||
| JP2000154816A (en) | Nut | |
| US20010032530A1 (en) | Torque extension for hex key wrench | |
| JPS6338964Y2 (en) | ||
| JP2001221215A (en) | Detachment prevention structure for insertion member | |
| JP2505670Y2 (en) | Fastener | |
| JPH0744456Y2 (en) | Set wrench with pipe handle for turning | |
| JPS6327132Y2 (en) | ||
| JPH0740260A (en) | Fastening member gripping jig for fastener | |
| JPS5920943Y2 (en) | driver | |
| JPH1128674A (en) | Screw and screwdriver structure | |
| JPH052305Y2 (en) |